sx v2.2.1

Changelog

• 35b89ad Add loading skeletons for remote vault fetches
• 4febd8d Cache vault extensions for instant boot
• 4693e2b SK-648: Allow New Folder in library picker
• 9b753af SK-648: Chip-back focused unpin, fix stale comment
• 8c71dfe SK-648: Consolidate sidebar into pinned + browse
• f86dd76 SK-648: Evict other snapshots on quota pressure
• b91924e SK-648: Fade count under keyboard focus too
• 73507cc SK-648: Make sidebar unpin keyboard-accessible
• 218a0c4 SK-648: Seed sidebar and list from boot snapshot